Rock drilling machine of the hammer type



Aug.25, 1931. H. s. POT-'mn 1,820,245

VROCK DRILLING MACHINE OF THE HAMMER TYPE Filed June 20, 1929 rPatentedV 2,5, '1931 Y' YHENRY SAMUEL POTTER, or JoHANNn'snU-BG.soiirnflirmon i' Rock nmmmenaonmnparrYrEg Appiicgtio'a nieu June 2o, ieeelseriai No: Massagen@nikinstal;'sfiaayafrieafmn allega? if This invention has for its? object to ensure *1 v yadequatey lubrication fori the working parts f' of rock drills lof the hainmer type and espe-` jl cially the shank of the drill,` thechuck and "51' the forward extension of the piston.`

' `According to` this invention,fthe cylinderl and' front'vheadv are preferably of integral construction, and a space isprovided on the f exterior ofV the `front head, having one' or- V more chainbersadapted to; befilled with i lubricant, the whole being coveredy with ak contractible casing, so that the lubricant can beexpressed by. the operator through outletv j Q ports to lubricate the various parts. l M l Further, according to the invention,fthe

- drill shank is fluted so 4as to co-act with acors respondingly splined. chuckor bushing in# serted therein, `a collar orv shoulder Abeing4 formed upon they drill shank atone `or more i suitable points to r providefa longitudinalv Vabutinentlfor the said cliuclcor bushing.y v

' Iny the vdrawings,Fig. 1 is a'longitudinal, section of the front heads of a rock drill confV structed Ain accordance -With'the present in-v v-ention,Fig; 2 is aldetail'yviewjin section,

illustrating the 4engagement of theY kdrill shankwith the chuck, F-igr?) is across-section v taken on the lineIIlI-III ofFig., 1, Fig.. 4,' isa detail view in section of the bushing, and Fig. 5 is a section thereof takenl on vvtheline V-VofFigl. i "1 N Referring toythe drawings, 6 indicates `the casing of the cylinder, the extension 6a of which constitutes'the front head of the drill. The chuck is vrotatably mounted yin the extendu y sion 6a andconsists of a cylindricalsleeve 7`v provided in its rearward part' witha plurality of Vgrooves-or Yflutes 7 a, or,` alternatively, formed of polygonalshape', so v'as to4 be adapted to co-act with acorresponding formation on the noseof thefpist'on (not shown) Inthe forward partofthe sleeve 7 is pressed a bushing 8 provided in Vits interior withvav plurality of longitudinall grooves 8a adapted to co-act withlutes 9 formed in the cylindrical portion 10 of the drill shank 11 by niilling. groovestherein. l f f VThe drill usedconsistsuof cylindrical hollow drill steelr of-as large a diameteras posi sible. Theiforwardextension of vthesteel is.

tiv'e'r'sleeve over thecylinder and front head i y fof themachine for'the purpose of lpreventing j v fbe connected with any approved means from v exhausting air from it. .Y This reductionof @llmese-.aile ae @etang 'gaat as i01- 5; givetheniininium diameter at the'backfof the vouttin'g,'edgeand the taperrhol'e 13 to give"A iajghigh velocity-,jet of `water at 1 the "point fot I Y rthfdrill., 1' 1 y 1 Y l 4The"cylindrical extensiony 1()Vv ofthe dfrillf` 'j shankis provided with a `collar or shoulder at 1 lthe `ifootlla ofthe extension forthe purpose# A ofproviding'anabutinent for the Abushing f AThis collar orshoulder is preferably formed" byv the ends '9a ofthe longitudinal grooves .of A f the shank,.the :forward end of the'b-ushing 8 being flared in such manner as to forni' al good Vlit with the V,curved portions '9a ofl said grooves.,f

14 indicates a contractible casing, e; g., of

rubber lor like resilient material, secured by o' i clampingringsl upon the'cylinder'e'xtenf "sion 6a,'the formation of the casingand the.

arrangement being V such that annular spaces'm 16 and'axial' spaces16a are: fornfedbetweenjy l# U i the casingil/l'and said extension l,6a. Saidf Vannular space is filled with lubricant by means of a suitable grease gun through. the nozzl'e'sl'?, and the lubrieant'may be eX-'` pressedthrough outlet-4 ports and 'passages 166 toany ofthe Workingpartsfofv the Ina- VlV jj 'i chine by the operator by ysqueezing the-conf tractible casing 14. If desired, the casing 14,-n a

may be extended rearwardlyVK over the wholeV of thecylinder 6 of the drill.

vFurther, the casing, 14 constitutes aflprotecffp, i

damage thereto by rough usage., 18 ndicates :the customary which is insert drillfshank. v

yThe interior space ofthe chuck sleeve 7 may 90' `air pressure/in the chuck sleeve assists indis-v tributi'ngthe lubricant over the working surf] faces of the sudati@ parte ofthe mattine, and ,9.5

1'. In agro-ok drill, a'front head, anda .con-i i' tractible casing secured. around thefront head and forming with it achainber for lubri-V l Y., cant, said head being provided with an outlet :n

y esta @d 'in the ceetfalthole-ofee connecting thesaid chamber ywith the interior of the head and operating to supply it with lubricant when the casing is squeezed. f 2. In a rock drill, a front head, a cylindri- 5 cal casing' of oontraetible material encircling the said head and forming With it a Chamber for lubricant, and clamping rings securing the end portions of the casing on the head, said head being provided with an outlet connecting the said chamber With the interior of the head and operating `to supply it with lubricant when the casing is squeezed.

3. In a rock drill, a front 'head kprovided externally with longitudinal spaces, and a .contractible casing provided internally with annular spaces, said spaces forming a charnber for lubricant, and said head being provided With an voutlet connecting the said chamber with the interior of the head and operating to supply it With lubricant when fthe easing is squeezed. l

In testimony whereof, 'I 'have signed my Y- lname 'to this specification at Johannesburg, Union off South Africa, this 18th vday of 25 m1551929.

' HENRY SAMUEL POTTER. 

